Telephone signaling system.



A. E. LUNDELL. TELEPHONE SIGNALING L'YSTEM.

APPLICATION FILED SEPT. 22, l9| 6.

Patented July 10, 1917;

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APPLICATION FILED SEPT. 22,1916.

Patented July 10, 1917.

5 SHEETS--SHEET 2.

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TELEPHONE SIGNALING SYSTEM.

APPLICATION FILED SEPT. 22. 19|6.' 1 332,944. Patented July 10, 1917.

H a. e m r d H m M N am H m M 3 e L m kon ilflll n \m 90. fl men 5 M KM 8 A m n ak 3 .Qn Q do- W A E LUNDELL. TELEPHONE SIGNALING SYSTEM. APPLICATION FILED sEPT,22,19|s.

Patented July 10,1917.

5 SHETSSHEET 4- A. E. LUNDELL.

TELEPHONE SIGNALING SYSTEM. APPLICATION nun SEPT. 22.. 1915.

1,232,944. Patented July 10, 1917.

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UNITED STATES PATENT OFFICE.

ALBEN E. LUNDELL, on NEW YORK, N. Y., ASSIGNOR r0 WESTERN ELECTRIC COMPANY, INCORPORATED, on NEW YORK, 11. Y., A CORPORATION on NEW YORK.

TELEPHONE SIGNALING SYSTEM.

Continuation of application Serial No. 121.565.

'1 b all II /l0), it may wow r12 Be it; known that I, Anni-1x l l. LUNIJI'ILL, a citizen of the United States, residing at New York, in therounty oi Bronx and State of New York, have invented rertain new and useful Improvements in 'Ielephone Signaling Systems, of Whh'h the following a full; clear, concise, and exact description.

This invention relates to signaling sys tems.

The present: a rontinualion of my application, Serial No. 101,766, tiled June f, 1916.

' The principal objert of this invention is to provide means, which may be in parteon] n10n to all oi. the eonnoeting eireuits of a. positionjnul in part individual to the various circuits, for enabling the operator to predetermine and control the rharm ter ol' ringing rurrent that is autoniatieally applied in estal'ilishiug eonneetion with a line.

to ring'wpnrtieular station of that line, and

to aseertain the. sort oi ringing" eurrent a partirula r connecting; eirruit; is set to apply.

The system of this invention is sin-h that the setting of the operator's switrhinn' apparatus to predet'rrinine the rhaia-arlrr ot' ringing eurren't that is to be applied auto niatieally by a parliruiar rhino-(ling (nouit, brings about rerlain ("bangles in said circuit which not only are instrinm-ntal in controlling, the ('hai'ueler ol the signaling eurreut that this eirrnit is thus adapted to apply, but also. control the displa ol' a eorrespmnlinn' one ol a number of .-a; ;nals

assoriated with the operatofs switrlnng ap= paratns to indicate to the=operator the SUN} ol' ringing eurreut -l'or whirh thoronnerting rircuit is set. The organization oi the system is such that when a ronneeting eireuit is changed throiigh the agency of the operators switchinginerhauism to adapt it for the application of a rertaiu sort of ringing current, it remains set to apply this sort of current. until the eonnertion is taken down or until the operator manipulates her switele i ug meehani srn.

'lhe selective application of ringing cnrrent to the connecting oireuit is preferably elieoted through the agency of an antomatie switrh oi the sequence switch type, this switeh being arranged to establish the differun: ringing current COITllillltltlOIlS in dift'erent positions of its movement and being arranged to move to any predetermined one ot its ringing positions under the control of the individualeonneet'ing eirenit controlling nmrhaninzn set by the switrhiug apparatus ronnnon to the position.

In ninlti rolliee telephone exchange systems in which part5 lines are used the selection oi the proper signaling current. is usual] routrolled by 'an operator located at the ollire in which the desired party line terminales. Thus the operator. in addition to the setting up oi. the eonneetioin is burdened also with the seleetiou oi the proper signaling, means. The selection of the signaling means heing usually eonholled by a variably operable switehing' derive, it may happenthat while th' moving to a deis device is sired operating position through intermedi ate operating pi'isitions. a signaling current souree is eonneeted to the line and the stil- (ions or station responsive to such current source are signaled.

lt is the further object of this invention to overeounthese diliieulties by pro'vidin an iinprmed inulti-otliee party line tele -so phone system in which the selection of the proper signaling means is controlled from a distant point, 1'. 0., outside of the olliee in -whieh the party line tOIll'llllllfGS the signaling of not'wanted stations being positively prevented Aeeordi'ng to one feature of this invention. nieu hs are provided at one oliire for eontrolliifgz the selectiveoperation of vari ably opwable switching devices loeated at a seven, ofliee and adapted to select the proper *signaling means for party line stations.

Aeeording to another feature of this invention, means are provided, in association with the variably operable switehing devices, for positively preventing the ronneetionof signaling current sourees until the switehingr device has reavhed the desired position. i

; ztrc weltknon'n in the art and a.

hon of the i the purties Still another feature of this invention has for its purpose the selection of the desired signaling current by means of u. device adapted to convey to an operator the called subscribcfis designation, whereby the sending-of impulses in addition to those designating the nun'ibcr of the line, is obviated.

According to another feature of this inrention, the selection of the proper signaling means follows immediately upon the extension oi the calling line to the called olfice.

The drawings rcpresei'it t1. semi automatic telephone excl'iauge system embodying the present invention. In Figure 1 a cellinu line circuit, at connecting operutors cord circuit and a selector switch adapted to extend the same are :1 13 opcrators position and associated apparatus end a party line circuit; Figs. 3 and & represent the called number indicat' ing Apparatus at the B operutors position,

and the distributing switch by means of which this :ig'iparetus may be associated with the selected trunk; and Fig. 5 name some the conui-ecting operators controlling device by menus of which the selector switch and the other selectively operable itching; devices may be adjusted. The drawings should be arranged by. placing Fig. 5 below Fig. 1., Fig. 2 to the right of Fig. 1, to the right of Fig. 2 and Fig. 4 to the right of Fig. 3. Only so much is shown of the circuits and controlling apparatus as is uecr sary for a clear understanding-oi," the present invention. "1 he selector and sequence switches and the con trolling apparatu for such switches are onl scheuniticull T indicated as their del A .l

tailed arrangement has no bearing on the present intention: Devices of this type descripsuine may be found in Patent No. 1,168,310 of ,lonuury 18., 19155.

A clear lllltlU-IShillltlll'lff of the invention -muy he hurl from the following detailed descri 'ition and the appended claims.

A calling subscriber at euhstzttimi 100 dc siring to obtain a connection with one of of a line No. 731 (Fig. 2), removcshis receiver from the switcl'ihook, whereupon relay LR becomesenergized and lights lump CL. A ("I noticing lamp CL lighted. inserts plug 101 into an nnsuering jack l0? in which the culling suhscribcrs line terminates. -A circuit is e tablished thereupon fro'rrrgrouiulcd battery. through the winding of a rut-otl' relay (0, the sleeve contacts of jack 102 end ,plut 101, and the winding of relay 103, to groom]. Relay (0 opens therircuit of relay LR, which in turn extingu'ishcs lump IL. Relay 103 closes a circuit from ground through its armature and front contact. a fcontact 104- and the power magnet of a sew'picnce switch 105, to grounded battery,

shown; Fig. 2 represents 112 and cti Hg operator I and this sequence switch moves under the control of its normal spring 106 into position 2.

\Vhcn sequence switch 105 reaches position 2, a circuit is closed from ground through a sequence switch contact 107, eonductor .108, :1 contact 500 and the power magnet of a sequence switch, 501 to grounded battery for moving this sequence switch into position 2. A circuit is now closed train grounded battery, through the windrug of a magnet 502, a sequence switch 00ntart 503 and the left-hand back contact and uru'nitru-e of it relay 501 to ground. Under the control of magnet 502, wipers 505 to 50 etc cord finder switch are moved over a contact bank in an upward direction. When the wipers reach contacts 510 to 514, individual to a cord or trunk 109, which was taken in use by the operator in extending the cull, a circuit is closed from ground through a sequence switch contact 110, con duetor 111, contact 511, wiper 506, a. contact 515 of sequence switch 501 and the winding of relay 504 to grounded battery. Relay 504.- opens at its left-hand back contact the circuit of memet 502, whereupon the finder is arrested with its wipers on the contacts representing trunk 109. Relay 50-1 closes :1 circuit from ground, through its left-hund armature and front contact; a' contact 510 and the power n'mgnet of sequence switch. 501 to grounded battery for driving this switch out of position 2 into position 3. \Vhen the sequence switch moves out of position 2 and opens contact m5, relay 504 does not become denergized, a locking circuit being grounded battery, through the winding of this relay, sequence switch contact 517, the rightlmnrl front contact and armature of relay 504, wiper-i507, contact 51? conductor sequence switch contact 113 to g'ground. j

The connecting operator depresses now :1 listening key 11 4-. connecting thus her telephone set 115 through the trunk 10!), in telephonic association. with the calling substation 100.

l n aecorrlnncc wllh the instructions received from the calling subscriber, the operator sets up on her keyboiird (Fig. 5) the number of the culled snlr c'riber. Supposing that the called sultscribers number is 7 lW, and that the called line terminates in un ofh c to which lcnrl u plurality of trunk lines tm'minutiug, in. the tenth group of contacts of :1 district selector 110, the opcrutor depresses keyfilfi in the district. kev 519 in the hundreds. key 520 in the tons. key 52] in the units and key 522 in the star tious row of keys These keys control :1. double series of counting relays (zero to nine) operable in scqi'lcnce by the action of in. stopping relay 523. It is noted that closed from 1o groundcd battery.

the hundreds, tens and units keys'are Wired in the same manner as shown in connection with the station and district rows of keys. The operator then depresses a start key 52 1, closing a circuit from ground, through the contact of this key, a contact 525 and the power magnet of sequence switch 501, whereupon this sequence switch moves out of position 3 into position 4-.

When sequence switch 501 reaches position 4, a circuit is closed from grounded battery, through the power magnet of an allottcr sequence switch 526, contact. 527 of sequence switch 501, and contact 528 of the allotter (which is supposed to he in position 1) to ground. Under the control of this circuit, the allottcr sequence switch ismoved out of position 1 into position 6. In this position of the allotter, another finder such as 529 is set in readiness for operation, due to the closure of a circuit from ground, through contact 530, a contact 531 and the power magnet of sequence switch. 501 asso: ciated with the finder 529 to grounded battery. This sequence switch was standing in position 18 and will now he moved into position. 1.

Sequence switch .105 lacing in position 2, a fundamental circuit is established from grounded battery, through. the winding-of a relay 117, a sequence switch contact 118, a (fO|1(lllClL()I\l1l), contact 513, wiper 508, a sequence switch contact 533, a conductor mu, the outer armature and back contact cl the upper zero counting relay, conductor 5 :35, the winding of the stepping relay 523, wiper 509, cohtact 5H. a conductor 120, and a sequence switch contact 121 to ground. Relay 11'? becomes energized and closes a circuit from ground, through its right-hand armature and front coutact,-a -sequence switch contact 122,:1 conductor 123, end the power magnet or" scqucncc switch 105 to gn'oundcd battery, for driving this sequence switch into position 3, in. which position relay 11? remains energized, due to the closurc of a locking circuit through its lefthand front contact and armature, and a soqucncc switch contact 124.

Storming relay 52? also becomes enercirccd and closes a circuit from "round' P through its front contact and armature, a. sequence switch contact 536, a conductor 53257, the contact ol lccy 518, conductor 538, [he armature and hack contact of the upper counting relay 9 and the winding of tho lowcr counting relay 9 to grounded hattcry. 'lhclowcr (Ullllllllfl'l'ttlity 9 becomes cncr grim-d and closes a cir uit from ground, through a scqucncc switch contact; 53!), conductor 540. the armature and front contact of thc ,lowcr counting relay 1'), the windings ol' the uppcr and lower counting relays fl lhe upper counting relay 9, however, is short-circuited, due to the closure of a shunt from its winding through conductor 538, lccy 518, conductor 537, sequence switch contact llili, and the front contact of the stopping rclay 523 to ground. i

Tn position. 3 of the sequence switch 105, a circuit is closed from grounded battery, through the winding of a driving magnet 12:"), sequciu'c switch. contact .1213, and the right-hand front contact and armature of relay 117 to ground. The magnet 1:55 bv attracting its armature 127, forces a brush rod 128 against a roller 12! constantly rotating in the direction indicated by the arrow. l'nder the control oi? this roller, the brush rod 128, with wipers 130, 131 and 132, and a co'nlnnitator hrush 133 mounted thereon is moved in an upward direction. Wipers 130, 131 and'lilz are adapted to wipe over the contacts of terminal bank 134, and brush 133 s adapted to travel over the conducting and insulating segments 13?) and 136 of a commutator plate 137.

When brush 133 reaches the first conducting plate 135 it connects ground through a conductor 1 7-8, sequence switch contacts 139 and .134 to relay 11?, causing thus the shortcircl-iitin; r o'E stcppin, relay 523. Upon its dciincrgization, relay 523 romoves the short circuit from around the Winding of upper counting relay 9, and' this relay becomes encrg'izcil. The upper counting, rclav 9 connects conductor 538 through its armature and Front contact and the armature and hack contact-of the upper counting relay 8 to the lower counting relay -8, which then operates in the same manner as the louver counting relay 9, to close a circuit for the upper counting relay 8, when brush 133 reaches the first insulated segment 136, whereupon the short circuit .is removed from the winding of the stepping relay 523, and this relay permits the operation of the lower counting relay 8. The operation of the countinn relays continues in' the same manner as described in connection with counting relays 9 and 8, until the upper zero counting relay hccomcs energized. This relay opens at its outer armature and front contact, the fundamental' circuit, preventing thus the rciincrgization ol stepping relay 523. The circuit of relay 117 is opened when. brush 133 encountors the next insulatinrr segment.

l-iclay i117 closes a. circuit from ground, through its righhhand armature and hack contact, a, sequence switch contact 140, conduclor 123, and the power magnet of so: qucncc switch 105 to grol'lndml battery for moving this scqucncc switch into position 6. A circuit is now closcdtrom grounded hat-- 18 throiuih the winding oi. a test relay 140 and a sequence switch contact 1141 to ground. The test relay hccouics energized and assum ing that the lirst trunk in the tenth group is busy and a ground is connected to best terurinal 142 oi such trunk, relay 140 remains locked up due to the extension of this ground through test. wiper 132, a coiii lu'ctor H3, and the right-hand armature, front contact and the winding of relay 1540 to grounded battery. The sequence switch it)? is now in position 7, it being driven there by a circuit closed through the left-hand armature and front contact of relay-140 and a sequence switch contact 1-H. Relay 140 closes a circuit from ground, through its left-hand armature and front cont-act, a

sequence switch contact 145, and the winding of the driving magnet 125 to grounded battery, and this magnet will cause the further travel of the wipers.

When the wiper 132 engages test terminalmultiples of terminalv 146. The seizure of the thus prevented. A circuit is also closed from ground through the left-hand armature and. back contact oirclay 140, a corn tact 151., and the power magnet of sequence switch 105 to grounded battery, for driving cquc-nce switch out of position 7 into position 1]..

Upon the encrgization of the upper zero counting relay, a circuitclosed from ground, through a sequence switch contact 541, the inner armature and vfront contact of the upper zero counting relay, and-the power magnet. of sequence switch 501' to 4 grounded battcry, lor moving the sequence switch into position 0. When the sequence Switch 501 loaves position at, a locking circuit of the counting relays is opened at sequence switch contact 539, and these relays become dciinergizcd.

When sequence switch 501 reaches position (5, av new 'Elmdanicntal circuit is estal lished from ground (Fig. 2-), through a sequence switch contact 200, trunk conductor 148,'wipcr-13l., a. sequence switch contact 152, conductor 120, contact 51 i, wiper 509, the windings of stepping relay 523, conductor-535, the outer contact and armature of the upper zero counting relay, conductor 534, sequence switch contact 533, wiper 50S, contact 513,. conductor 119,11v sequence switch contact 15;}, wiper 130, conductor 147, a. sc quence switch-contact 201, and the winding of a relay 202 to grounded battery. Relay 202 closes a circuit from ground through its right-hand armature and front contact, a sequence switch control 203, conductor 204, and the power magnet. of sequence switch 205 to grounded battery, for driving this sequcnce switch out of position 1 into posi- ,tion' 2. A circuit now closed from ground,

through sequence switch contact 206, com ductor 207, a contact 300 and the power magnet of a sequence switch 301 to grounded battery, for moving this sequence switch out of position 1 into position 2.

A'circuit is established from grounded battery, through the right-hand armature and back contact of a relay 302, a sequence switch contact 3025 and the winding of a magnet 30% to grouiulctl battery. Under the control of magnet 30+. wipers 2-305, 306, 30?, 30b, E305) and 310 of a trunk finder switch are moved in an upward. direction over a terminal bani; containing contacts rtqn-cscnting trunks. Vhen these wipers rcach a set of contacts 311, 312, 313, 211i, 315 and an: individual to trunk 147, 1&8 seized bv district, selector 11.6, a circuit is established from ground through a sequence switch contact, 208, conductor 209, contact 311, wiper. 305, a sequence switch contact 317, and the winding of'rclay 302 to ground cd battery. U 'ion energization relay 302 opens at its right-halal back contact the circuit of nnignet Slat, causing thus the arresting of the trunk tinder switch. This relay closcs a circuit from ground through its righthanrl armature and front contact, a contact MS and the power magnet of se qucncc switch 301 to grounded battery, for driving this sequence switch out of position 2 into position 6. Relay 302 is maintained energized due to the closure of a locking cir-. cuit l'l'tllll grounded battery through lts. winding, a sequence switch contact 319, the

left-hand front contact and armature of relay 302. wiper 306, contact 312,conductor 320, and a sequence switch contact 208 to ground.

A circuit is now closed from ground, through a sequence switch contact 321,w1per 3308, contact 314 a conductor 322, a contact 5 209, and the power magnet of sequence switch 205 to grounded battery, for driving this'sequence switch into position 3. A circuit is closed from ground, through the right-hand armature and front contact of 2a relay 202, a sequence switch contact 210, a conductor 211 contact 3ll.(i, 'Wiper 310, a Sequcnce switch contact 323, a conductor 324:, and the winding of a ste1' ping magnet 400 to grounded battery. lt'l'agnet 400 is adaptlay a circuit is established from ground,

through the front contact and armature o'f' this relay,-a sequence switch contact 51 ii. a conductor .343, the hundreds key 51.0, a conductor 544, the armature. and back tontaci of the upper countinnrelay T. andthc winding of the lower counting relay 7 to grounded battery. In the same manner as nliovc described, the lower counting relay 7 liccomes energized and prepares a' circuit for the upper counting relay 7.

Upon energization, magnet 400 closes a circuit from ground, through its armature and front contact, arm 4-01, conductor 102, and the power magnet of a hundreds num ber indicator 4-03, to grounded battery. The number indicators 103, 4101, l?) and +06 are,

of the well-known sequence switch type. and control the contacts shown in Fig.1 4 between the dotted lines to the right and left of the indicators, respectively. iVhilc theseindicators are moving between the positions indicated at their respective normal springs 407, 4-08, 409, 110, they close contacts 411, 412, 413 and 414, respectively. Thus a. ground will. be intermittei'itly connected. through contact 4-11. conductor 419, a sequence switch contact 3:25, wiper 309, contact 3155. Conductor 320, a sequence swi ch contact 212, and the left-hand armature anl front contactof relay 202 to the fundamental circuit in the same manner as tl'1l.'(')ll 1'll commutator brush 1 The stepping magnet 523 is shunted asmany times as contact 411 is closed for controlling the successive operation of the counting relays.

\Vhen theupper zero counting relay is energized, the llliliCflllOl 403 is in position 7. The opening of the fundamental circuit by the upper zero counting relav results in the dci nergizationof relays 5221- and 203, and the movement oi sequence switch 50L into position 8] Relay 202 opens at itsrighh hand armature and front-enamel the'circu'it of stepping magnet 400, whereupon this magnet becomes dei nerg'izcd and moves a rm 4-01 into position 2, iuwhich position indicator 4:04 is connected in circi-iit. Indicator 40-1 operates in the same manner as indicir tor 403, with the difference that it will be stepped'into. a position determined by key 520. After-the stepping of indicator 40%, sequence switch 501' is moved, into position '10, and magnet 400 moves the arm 401 into itsthird position. connecting ind' 'at'or .105 into circuit, and after this indicator has been stopped in accordance with the predetermined number of counting relays connected in circuit under the control of the units key 521, sequence switch 501 moves into position .12,and arm 401 into position -1 whereupon indicator. 406 is operative. I

After the impulses predetermined in he 522 have been received under on control of contactilet, sequence switch 501 moves into position 16, and the fundamental circuit is contact 210. trunk opened at the hack contact of the upper zero counting rela v. The pawl and ratchet arran niment of magnet 400 so constructed that upon the fourth deenergization. of this magnet. tl i arm l0l is returned to its normal position. in ponilioll 10 of the sequence switch :30]. a. circuit is closed from ground, through a sequence switch contact 53-h"), wiper 505, contar.:t fill), conductor 540. and a. contact 151 and the. power magnet of sequence switch to grounded hatlcry, for moving this sequence switch out of position 11. into position 10. \Vhcn contact 113 is opened,. relay 501 becomes dci nergi'ned, and closes a. circuit from ground. through its lett-hand armature and back contact. a contact 547, and the power magnet of sequence switch 501 to groumlial battery. for moving the sequcnee switch into position 17. A circuit is then closed from ground through a sequence switch contact 548. and the winding of a magnet 5+0 to grounded. battery. Underthe control oi magnet 54! the wipers 505 to 50.) of the cor finder switch are. driven in a downward direction, and when they reach the normal position, contact Fillet the finder switch is closed and a circitit is established fromground through contact 550, a contact 551 and the power magnet 'of sequence switch 54H to grounded battery. for moving this sequence switch into position 18. The sequence switch will remain in this position until allotter 520 is moved into position 1. and closes a circuit through its contact 528 and a sequence switch contact 552, for driv- 1% inc; the sequence switch out of position 18 inloposition 1 and allotting thus the cord finder for service. As soon as the. indicator switch 406 moves out oi position a contact 420 is closed, 195 and upon the last dci nergization of magnet 400 a circuit is established from ground, through the armature and back contact of this magnet. contact 4120, conductor 421, a "contact 328 and the power magnet of 50- qncncc switch 301. to grounded battery,' for iiioviinr this sequence switch out of position 15 into position 7. A circuit is then closed from ground through sequence switch contact 320. wiper 307. contact 313, conductor 115 130. a contact 213 and the power magnet of sequence switch 20.) to grounded battery, for moving this sequence switch out of position, 3 into position 7. hen sequence switch 205 moves out. of position 3, relay "202 becomes ileincrrfizerli \Vhcn sequence switch 205 rcaolu-s position 4, a circuit is closed t'l'oni grou'nded battery. through the I winding of a. relay 214. the n'imary windjug of a repeating coil 215, a sequence switch cmu'luctor 147, wiper 130, a sequence switch conlact 100, the contact of a iii-ringing her 101 an the secondary winding of a riqJeating'coil 162 to ground.

Belay 214 becomes energized, and connects 1 30 Relay 241' cannot become energized, due to a. shunt placeiil around its winding through the armature and back contact of a ringing cut-ott' relay 250. Upon the subsequent actuation. of contact 285 by cam 231, a circuit is estaljilishcd from a positive superin'iposcd signaling current source 951, contact spring 235, the left-hand winding of ringing cut-- off relay 250. sequence switch contact 252, conductor 253, the upper front contact and armature of ri! Ting relay 240, the tip cn-- tacts of plug 22 and jack 225, limb 254 of the called line, the relays 255 atthestations J, R, M, W, in multiple, limb 256 of the called line, the ring contacts of jack 215 and plug 224:, the lower armature and front contact of relay 2 .4.0, conductor "257, and a seql'lence switch contact 258 to ground.

'.lhe relays E255 are responsive to superimposed signaling currents sent out from. sour 251 and 259, and by attracting their armatm'es connect the bells of all. stations into the ringing circuit, but only the bell associated with station W will. respond to the current flowing through the circuit. The ringing cut-ott relay 250 marginal. and will not become energized until the called party removes his receiver from the switch:

hook. When this happens relay that] becomes energized, current being supplied thereto.

from sources .251 or 260, depending upon whether contact 235 is actuated or not at this time. Upon the energization of ringing cut-oil? inlay 250. the shunt is removed from around the winding of relay 2&1. and this relay, by attracting its armature, short-circuits relay 2-40. A snipervisory relay it-i1 is energized then in the well-known manner, and causes in turn, the energization of a supervisory relay 163 at the connecting operators positicm.

\Vhen the called party desires disconnection he restores his receiver to the switch hook. energized. dei nergizingin turn supervisory relay 1625, and if supervisory re. lay 164 has also been deiinergizcd in res iumse to the hanging up of the re ceiver at the station 100, the connecting operator removes plug 101 from Jack 109..

switch 105 out of position 16 into position 18. A circuit is now closed through sequence switch contact 166 for energizing a magnet 167 and under the joint control of this i'uagswitch 105 to grounded battery. Sequence Supervisory relay 261 becoi'ues de Relay 103 becomes deenergized andcloses a driving circuit through sequence switcl'i contact 165 for moving sequence switch 105 moves into position 1 and mag net 167 becomes deenergized.

Selector 116 being restored, relay 214; be

comes deenergized and opens the circuit of relay 219. A. circuit is then closed from.

ground, through the back contact and armatin-e oi relay 21.9, a conductor 245, a contact 246 and the power magnet of sequence switch 205 to grounded battery. for moving this sequence switch out of position into position 1. When. this sequence switch reaches positionl, the lamp 230 is againlighted by way of sequence switch contact and the front contact and armature of relay 2 6. The B operator noticing the, signal removes plug from jack .225, where upon the apparatus is restored to normal.

It the called party hangs up his receiver before the calling party has finished the conversation, the calling party will instruct the connecting operator to raring the called party. The connecting operator actuatcs key nu and opens thus the circuit of relay 2H. Upon the deenergizatiou of this relay, relay 219 is maintained energized by a circuit extending from ground, through the winding of relay 319. contact 243, conductor 244, the primary of repeating coil 1215, sequence switch contact 2-17, conductor 14S, wiper 1-31.. the winding of relay H33 and. the secondary of repeating coil 162, to groul'ah-ujl batt ry. The deenergization of relay 21-ieaus 1 the unlocking of relay 241, and when relay 214 again becomes energized upon the releasing of key 161, it will establish in the same manner as above doscribed an actuating circuit for relay 240,

and this rehiy will cause the application of ringing current to the called line in the above described. manner.

The bells at the party line stations are ar- "anged in such a manner that the bell of station. W responds it the positive current source 251 is connected to the tip side 254: and grol'uul to the ring side 256 of the line. The hell of party M acts if the negative current source 259 is connected to the tip siclefilfist and ground to the ring Side 256 of the line. The bell of party R operates if positive current source 251 is connected to the ring Shle256 and ground to the/tip side 25% of the line. The bell of party J responds when the negative current source 259 connected to the ring side 356 and ground to the tip side 25 i of the line.

When the operator inserts plug 224 into ]:\(l{ 99.") for ringing party V. first the lee e contacts of. the plug and jack may contact, resulting in the encrgiziaticm ot relay 2"(3, whereiu'iou. as above described, sequence switch 205 moves into position 9. While the plug is being pushed into the jaclc. the tip of plug 224- may contact with the ring of the jack. Should the ringing current source 251 already be connected through contact 252, positive pulsating current would be applied to the ring conductor 256 and thus a station like R. where thebell is normally connected to the ring side of the line, would be signaled. However, above described, contact 252 is closed only after cam 233 has operated spring 237, that is to say, while both ringing current sources 251 and 25$) are disconnected at contact springs 235 and 236 of cams 231 and 232. rangenient. the touching of the ring contact of jack 225 by the tip of plug will not result in the ringing of a station this being performed only after the plug has been positively inserted into the jack.

If the signaling of party R is desired, the connecting operators controlling apparatus controls the moving of indicator 406 into position R, in which position contacts 425 and 426 are closed. \Vhen, therefore, sequence switch 205 reaches position 8, a circuit is es 'tablished from grounded battery through contact 426, conductor 427, sequence switch contacts 200 and 222. and the right-hand front contact, armature and winding ol relay 220 to ground- The relay 220 will thus not be denergized when contact 221 is opened, but remains held up through this circuit until the sequence switch reaches position 11, whereupon a new circuit is closed for relay 220 from grounded lmttery'tl'irough contact 425, conductor 4e28, sequence switch i contacts 261 and 222 and the right-hand contact, armature and winding of relay 220- to ground, for maintaining this relay ener gized. Relay 220 keeps thus the driving cir-- cuit of sequence switch 205 closed at its lefthand armature through sequence switch contact22S until the sequence switch reaches position 14, whereupon the holding circuit of relay 220 is opened at contact 261 and the sequence switch 205 is moved under the control of its normal spring into position 15.

The circuit of relay 240 being held open at the left-hand back contact of relay 220. this relay 2410 cannot become energized until se quence switch 205 leaves position 14. When cam 231 actuates contact spring 235, a circuit is closed from the positive current source 251 through the left-hand winding of ringing cut-off relay 250, sequence switch contact 262, the lower contact and armature of relay 240. conductor 2'37. the ring contacts of plug 224 and jack line conductor 256,

relays 255 in multiple. line conductor 54, the tip contacts of jack 2'35 and plug 2 .4, the upper arinatin'e and Front contact of relay 240. conductor and sequence switch contact 203, to ground. The bell of station ll i ponds to this current as preriously descriocd.

It the signaling of party M is desired, only contact 420 is closed and therefore relay 220 becomes deenergized when sequence Due to this ar-.

switch 205 reaches position 11, its circuit being open at contact 260. The sequence switch 205 stops in position 12, from which position it is moved out under the control of cam 233 in the same manner as was de scribed in connection with the signaling of party W. The ringing circuit for party M is established through Selllllx'xiti switch contacts 264 and 258. the ringing relay 2-10 being energized when sequence switch 205 leaves position 11.

If party, J or a direct line is desired, then contacts 426. and 430 are closed. \Vhcn sequence switch 20:") reaches position 14, a circuit is established from grounded bat tery through contact 430, conductor 431. sequence switch contacts 265 and the right-hand front contact, armature and Winding of relay 220 to ground. This relay holds its armature attracted in position 15 of sequence switch 205. and the sequence switch is moved into position 17. In position 16 of the sequence switch. relay 220 becomes definergized and closes the circuit of relay 240, whereupon the ringiugcircuit is established through r' 'uenrc switch contacts 200 and 263.

It will be seen iron: the above that the circuit of ringing relay 240 adapted. to associate the selected, ringing current source with the line. is maintained open at the lefthand bacli' contact of relay 220 until scqucnce switch 205 reaches positions 8. 11, H and 16. respectively. depending upon the setting of indicator 400. it. for example. the signaling of party R is desired. the ringing relay cannot become energized until ar'tcr sequence switch 205 has left position 14, and therefore the ringing of stations \V and M, while this sequence switch moving through its operating positions 10 and 13,

positively prevented.

Although only one trunk 147. HS extend ing between the district selector and plug has been shown in Fig. 2 ol the drawinns. it Will be obvious to those skilled in the art that in commercial telephone sys tems there are a plurality of such trunks, each trunk being provided. with controlling apparatus (relays, sequence switches, etc.) similar to those shown in Fig. 2.

What is claimed is:

1. In. a. telephone exchange system, a plurality of oflices. a calling line terminating in. one ollirc and a called line terminating in a second ollire. a plurality of stations associated with. said called line, trunk linfes extending between said oflices, variably operable connecting means for extending said callinc; line to one end and other variably operable. connecting means for extending said called line to the other end of any one of said trunk lines, a plurality of different selective signaling means for said stations at said second office, and means inand y eluding a switch eonnnon to said pll'u'a'lity rallty of differentselective signaling means of trunk lines and controllable from said for said stations, a variably operable switchfirst mentioned other for controlling the as ing device adapted to associate in each of its sociation of any one ol said signaling means operating positions a dillerent signaling with the called line irrespectiveof'tlie variameans with the line, variably adjustable tions in the operation of either of said eonmeans for causing the movement ol said necting means. switching device into a position next to the 2. In a telephone exchange svstenif. a, pludesired position, and separate lneans operarulity ot' oi'lices, a eallinglineterminating in 4 tive thereupon lor lllfl\'lll "!-t2ll(l switching 19 one oilice and :1 called line terminating in a device into the desired position to associate second office, a pluralitvot stations assoa signaling means with the line. ciated with said called line, a plurality of H s s' X -i plurality trunk lin Ext-ending between the olfices, a of stations associated with said line, a pluralvariably operable selector switch for exity of different selective signaling means for 15 tendingthe calling line to one end and vasanl stations, a variably operableswitching 8O riahly tn'wrahleconnecting means for extend- I devn-e For selecting a signaling means. means i th fl rl li t th ythpyv nd f ny controllable from a distant point for niovone of saidtrunk lines, a plurality of dit ing said switching device to a position next feren't selective signaling means for said tothe desired operating position, a relay 2 stations at said second ollice. and controladaptedto connect the signaling means to [i g Home i l li n im-l, t id the line |n all operating positions of said deond ofiice common to said plurality ol trunk me ns Smaatod with said switching lincsand controllable from the first ollice for iv-Viol! f r Causing it to move to the desired i ti any if id i li means I position and means for actuating said relay 4 25 with the called line ll'l'OSPUCtlVq', of the yaria i 515ml i f into Heid detions in theopcration of said selector or "l Positmnsconnecting means. -T. -ln (:()]lll)l1l:lfl(ill. a telephone line having 3. In a telephone exchange system, a plu'- a p ura ity of talking t-oiulnetors. two subrality of ollices. a. calling line terminating h'r'll ers stations: on said line, signaling dein one o d ll d .l i t i ti g \"H'LH at said sl'at|ons res1wctively'. each assoin a ffice 1mm]; line extending l' c- ImlOIl With :1 llllllltllt ('U|l lll(1t()i', :l source tween .said offices, means for extending the. ol' ringing rurrent, a linnting'swilch l'or ni li t on, d d mung f( yo ning said source to one or lhe other of tending the called line.to another end of said conductors, and manually controlled 35 any one of said trunks,a callednumher indicontacts lor governing the. stopping of said eating device at the second oiliee common to switch. said trn'nks,-.controlling'apparatus for said fi."lhe combination with a telephone coll device at the first office, a plnralit of ditu rl'lng circuit. of a ringing circuit. havingferent selective signaling means for said a plurality of brinn-hes. a controlling rir- 4 stations, and meansdependen't on the operacult having a plurality of brain-hes ro|'|'e tion of said indicating device for associating sp nding in number with the brain-hes of a signaling means with the-called line. said ringing eireuih switching mechanism 4.. In a telephone eihange system, a call- For (losing anv branch of said controlling 7 ing and a. called line, a plurality of stations circuit, and an automatic switch adapted in 5 associatedwith sa'idIcalled line, trunk lines, its movement In establish eorrespoiuling cminecting means for-extending said calling, branches of said ringing circuit and said line to one end and other connecting means controlling circuit one after the other, said. for extending said ealled'line to the other controlling circuit being adapted to control. end of any one of said trunk lines, a pluralthe movement of said automatic switch to ity of different selective signaling means bring-the same to rest in a position icorrefor said stations, a variably operable switchsponflding with lhe partieuliubranch ldt h ing device adapted to associate in each of its rontrplling circuit that is closed. operating positions a different signaling 1). in a telephone systenn the combinameans with the line, controlling apparatus tlon with a plurality of connecting circuits,

55 for said switching device located at a dis-' of a multiple brain-h ringing circuit assotant point, means operable in "accordance eiated with earl: of said connecting circuits with the adjustment ofsaid controlling apan eler-troniagnetic switch eontrolling paratns for moving said switching device closure oteach of said ln-anehes, operatota Into a position next to the desired position, switching nn-ehanisni common to said coir-- g and separate means operative thereupon for necting l'll'l'llllS and adapted l b moving said switching device into the deinto assm'iatlon with anv one of the siting sired operating position to associate a sigsaid switching llu-rlnulisln being adapted tci nalia means with. the called line. control said branch controlling eleoti un a signaling system, aline, a plural magnetic switch, and signals associated with 55 lty statlonsflssoclated therewith, a-p 1psaid operalors swil ching mechanism and [30 of a'plurality of sources of ringing current, switching mechanism associated with each of said circuits and adapted to .beiset selectively to control the application to the associated circuit of ringing current from said various sources,operator-s keys for controlling the selective setting of said switching mechanism, said keys being adapted to be brought temporarily into association with any of said connecting circuits. and indicating means associated with said keys for indicating the setting of the switching mechanism. of the connecting circuit with which said keys are at the time in association.

12.'-In a-tclcphone s item, the combination with a connecting circuit. of a ringing circuit having a plurality of branches, a controlling circuit having corresponding branches, means for changing the electrical condition of any one of said controlling cirtion with a plurality of co necting circuits,

cuit branches, an automatic switch adapted in its movement successively to establish the branches of said ringing circuit and simultaneously bring itself under the control of the corresponding branches of the controlling circuit, and means responsive to the changed electrical condition of. any-controlling branch for stopping said switch.

13. In a telephone systemfthe combination with a connecting circuit, of a ringing current {generator adapted to deliver impulses o ringing current and pick up im pulses having a predetermined relation to each other, a ringing circuit normally open at two points, a switch for closing theringing circuit at one point, and anclectrically actuated switch operated by a pick-up in1 pulse for closing the ringing circuit at the other point.

'14. In a telephone system, the combination with a connecting circuit, of a normally open ringing circuit having a plurality of normally open branches, an automatic switch adapted in its movement successively to close said branches, means for closing said ringing circuit and stopping said switch at a waiting point immedately preceding a branch-closing position of the switch, and means for moving said switch from said waiting point to said branchclosing point.

In witness whereof, I hereunto. subscribe my name this 21st day of September A. 1).,

' FALBEN LUNDELL. 

